:root{
  --sdu-blue:#0a2a6b;
  --sdu-blue-dark:#061a46;
  --sdu-yellow:#f2b100;
  --sdu-yellow-dark:#d89a00;
  --sdu-white:#ffffff;
  --sdu-border:#dbe4f0;
  --sdu-text:#1c2533;
  --sdu-text-light:#69758a;
  --sdu-container:1280px;
  --sdu-transition:all .3s ease;
}

*{
  margin:0;
  padding:0;
  box-sizing:border-box;
}

body{
  font-family:"Poppins",sans-serif;
  overflow-x:hidden;
}

a{
  text-decoration:none;
  color:inherit;
}

img{
  display:block;
  max-width:100%;
}

.sdu-container{
  width:min(100% - 32px, var(--sdu-container));
  margin:0 auto;
}

.sdu-header{
  position:sticky;
  top:0;
  z-index:9999;
  background:#fff;
  border-bottom:1px solid rgba(10,42,107,.08);
  box-shadow:0 2px 10px rgba(0,0,0,.04);
  height: 82px;
}

.sdu-header-inner{
  min-height:86px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:22px;
}

.sdu-logo{
  display:flex;
  align-items:center;
  flex-shrink:0;
  max-width:290px;
}

.sdu-logo img{
  width:100%;
  max-width:260px;   /* logo chota */
  height:72px;
}

/* DESKTOP NAV */
.sdu-nav{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:28px;
  flex:1;
}

.sdu-nav > a,
.sdu-nav-item > a{
  color:var(--sdu-blue-dark);
  font-size:15px;
  font-weight:600;
  line-height:1;
  padding:30px 0;
  display:inline-flex;
  align-items:center;
  position:relative;
  transition:var(--sdu-transition);
  white-space:nowrap;
}

.sdu-nav > a:hover,
.sdu-nav-item > a:hover{
  color:var(--sdu-blue);
}

.sdu-nav-item{
  position:relative;
  display:flex;
  align-items:center;
}

.sdu-mega-menu{
  position:absolute;
  top:100%;
  left:50%;
  transform:translateX(-50%) translateY(12px);
  width:780px;
  background:#fff;
  border:1px solid var(--sdu-border);
  border-radius:20px;
  box-shadow:0 20px 50px rgba(15,4,76,.14);
  padding:24px;
  display:grid;
  grid-template-columns:repeat(3, minmax(0, 1fr));
  gap:24px;
  opacity:0;
  visibility:hidden;
  pointer-events:none;
  transition:.25s ease;
  z-index:9999;
}

.sdu-nav-item.sdu-has-mega:hover > .sdu-mega-menu{
  opacity:1;
  visibility:visible;
  pointer-events:auto;
  transform:translateX(-50%) translateY(0);
}

.sdu-mega-col h4{
  font-size:15px;
  font-weight:700;
  color:var(--sdu-blue-dark);
  margin:0 0 10px;
  padding-bottom:8px;
  border-bottom:2px solid rgba(242,177,0,.45);
}

.sdu-mega-col a{
  display:block;
  color:var(--sdu-text-light);
  font-size:13px;
  line-height:1.5;
  padding:6px 0;
  transition:var(--sdu-transition);
}

.sdu-mega-col a:hover{
  color:var(--sdu-blue-dark);
  padding-left:4px;
}

/* RIGHT BUTTONS */
.sdu-header-right{
  display:flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
}

.sdu-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:0 18px;
  border-radius:14px;
  font-size:14px;
  font-weight:600;
  white-space:nowrap;
  transition:var(--sdu-transition);
}

.sdu-btn-outline{
  background:#fff;
  color:var(--sdu-blue-dark);
  border:1px solid var(--sdu-border);
}

.sdu-btn-outline:hover{
  background:#f7f9fc;
}

.sdu-btn-primary{
  background:linear-gradient(135deg,var(--sdu-yellow),#ffcb2e);
  color:var(--sdu-blue-dark);
  box-shadow:0 10px 24px rgba(242,177,0,.25);
}

.sdu-btn-primary:hover{
  transform:translateY(-2px);
}

.sdu-menu-btn{
  display:none;
  width:44px;
  height:44px;
  border:none;
  border-radius:12px;
  background:var(--sdu-blue);
  color:#fff;
  font-size:22px;
  cursor:pointer;
}

/* MOBILE PANEL */
.sdu-mobile-panel{
  display:none;
}

/* RESPONSIVE */
@media (max-width: 1199px){
  .sdu-nav{
    gap:18px;
  }

  .sdu-nav > a,
  .sdu-nav-item > a{
    font-size:14px;
  }

  .sdu-logo img{
    max-width:220px;
    height: 70px;
  }
}

@media (max-width: 991px){
  .sdu-header-inner{
    min-height:74px;
  }

  .sdu-logo img{
    max-width:180px;
  }

  .sdu-nav{
    display:none;
  }

  .sdu-header-right .sdu-btn{
    display:none;
  }

  .sdu-menu-btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
  }

  .sdu-mobile-panel{
    display:none;
    background:#fff;
    border-top:1px solid var(--sdu-border);
    padding:12px 16px 18px;
    box-shadow:0 14px 30px rgba(0,0,0,.08);
  }

  .sdu-mobile-panel.active{
    display:block;
  }

  .sdu-mobile-nav{
    display:flex;
    flex-direction:column;
  }

  .sdu-mobile-nav a{
    padding:14px 4px;
    border-bottom:1px solid #eef2f7;
    font-size:16px;
    font-weight:600;
    color:var(--sdu-blue-dark);
  }

  .sdu-mobile-btns{
    display:flex;
    flex-direction:column;
    gap:10px;
    margin-top:14px;
  }

  .sdu-mobile-btns .sdu-btn{
    width:100%;
    display:inline-flex;
  }
}

@media (max-width: 767px){
  .sdu-container{
    width:min(100% - 24px, var(--sdu-container));
  }

  .sdu-logo img{
    max-width:160px;
  }
}